Lewis weather by month
What a typical year looks like in Lewis, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at CORTEZ, 18 km from Lewis; records cover 1911–2026.
The year at a glance
- Precipitation a year
- 11.8 in299 mm
- Snow a year
- 33 in85 cm
- Last spring freeze
- May 13
- First fall freeze
- Oct 4
- Heating degree days
- 5,818
- Cooling degree days
- 681
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 0°−18° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Lewis in January
Highs average 43°6° and lows 17°−9°, with 1.1 in27 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 63°17° (1994)
- Record low
- −27°−33° (1937)
- Heating degree days
- 1093
- Cooling degree days
- 0
Lewis in February
Highs average 47°8° and lows 22°−6°, with 0.96 in24 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 79°26° (1986)
- Record low
- −31°−35° (1933)
- Heating degree days
- 858
- Cooling degree days
- 0
Lewis in March
Highs average 56°13° and lows 28°−2°, with 0.86 in22 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −7°−22° (1939)
- Heating degree days
- 719
- Cooling degree days
- 0
Lewis in April
Highs average 64°18° and lows 33°0°, with 0.72 in18 mm of precipitation and 2.2 in5.6 cm of snow in a typical April.
- Record high
- 88°31° (1932)
- Record low
- 6°−14° (1945)
- Heating degree days
- 504
- Cooling degree days
- 0
Lewis in May
Highs average 73°23° and lows 41°5°, with 0.93 in24 mm of precipitation and 0.3 in0.8 cm of snow in a typical May.
- Record high
- 95°35° (1932)
- Record low
- 15°−9° (1990)
- Heating degree days
- 253
- Cooling degree days
- 15
Lewis in June
Highs average 85°30° and lows 49°10°, with 0.37 in9.4 mm of precipitation in a typical June.
- Record high
- 102°39° (2013)
- Record low
- 27°−3° (1934)
- Heating degree days
- 47
- Cooling degree days
- 118
Lewis in July
Highs average 91°33° and lows 57°14°, with 1.3 in32 mm of precipitation in a typical July.
- Record high
- 102°39° (2003)
- Record low
- 31°−1° (1915)
- Heating degree days
- 2
- Cooling degree days
- 276
Lewis in August
Highs average 88°31° and lows 56°13°, with 1.3 in34 mm of precipitation in a typical August.
- Record high
- 102°39° (2026)
- Record low
- 30°−1° (1915)
- Heating degree days
- 5
- Cooling degree days
- 214
Lewis in September
Highs average 80°27° and lows 48°9°, with 1.5 in38 mm of precipitation in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 23°−5° (1930)
- Heating degree days
- 93
- Cooling degree days
- 57
Lewis in OctoberThis month
Highs average 67°20° and lows 36°2°, with 1.1 in27 mm of precipitation and 0.6 in1.5 cm of snow in a typical October.
- Record high
- 90°32° (2024)
- Record low
- 7°−14° (2019)
- Heating degree days
- 421
- Cooling degree days
- 1
Lewis in November
Highs average 54°12° and lows 26°−3°, with 0.85 in22 mm of precipitation and 2.7 in6.9 cm of snow in a typical November.
- Record high
- 75°24° (2005)
- Record low
- −14°−26° (1931)
- Heating degree days
- 752
- Cooling degree days
- 0
Lewis in December
Highs average 43°6° and lows 18°−8°, with 0.89 in23 mm of precipitation and 7 in19 cm of snow in a typical December.
- Record high
- 67°19° (2025)
- Record low
- −22°−30° (1978)
- Heating degree days
- 1071
- Cooling degree days
- 0
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